阅读说明：本技术 一种定位精确的曲轴直驱机油泵 (Accurate-positioning crankshaft direct-drive oil pump ) 是由 李文 许仲秋 刘光明 佘笑梅 于 2020-06-29 设计创作，主要内容包括：一种定位精确的曲轴直驱机油泵,涉及机油泵技术领域,其包括泵体、泵盖、内转子以及外转子,所述内转子的内壁面上设有多个用于配合曲轴外壁纵切面的台阶面,所述泵体上开设有供曲轴插入的轴孔,所述轴孔的内壁面沿环形方向间隔设置有多个可抵靠住曲轴外壁面的凸出的卡爪,通过多个卡爪的定位限制可提高所述曲轴与所述轴孔二者的轴线重合度。本发明可在极大程度上减小曲轴装配出现的偏离误差,从而防止机油泵的转子被挤到一侧。(The utility model provides an accurate bent axle of location directly drives oil pump, relates to oil pump technical field, and it includes the pump body, pump cover, inner rotor and outer rotor, be equipped with a plurality of step faces that are used for cooperating bent axle outer wall longitudinal section on the internal face of inner rotor, set up on the pump body and supply bent axle male shaft hole, the internal face in shaft hole is provided with a plurality of convex jack catchs that can support and live bent axle outer wall face along the annular direction interval, and the location restriction through a plurality of jack catchs can improve the bent axle with the axis coincidence degree of the two in shaft hole. The invention can reduce the deviation error of crankshaft assembly to a great extent, thereby preventing the rotor of the oil pump from being extruded to one side.)

1. The utility model provides an accurate bent axle of location directly drives oil pump, includes the pump body (1), pump cover, inner rotor (2) and outer rotor, its characterized in that: be equipped with a plurality of step faces (2 a) that are used for cooperating bent axle (3) outer wall longitudinal plane (3 a) on the internal wall face of inner rotor (2), offer on the pump body (1) and supply bent axle (3) male shaft hole (4), the internal wall face in shaft hole (4) is provided with a plurality of convex jack catchs (5 a) that can support to live bent axle (3) outer wall face along the annular direction interval, and is through a plurality of the location restriction of jack catchs (5 a) can improve bent axle (3) with the axis coincidence degree of the two in shaft hole (4).

2. The crankshaft direct-drive oil pump with accurate positioning according to claim 1, characterized in that: and a positioning ring (5) is fixedly arranged on the inner wall surface of the shaft hole (4) along the annular direction, and the clamping jaw (5 a) is arranged on the inner wall surface of the positioning ring (5).

3. The crankshaft direct-drive oil pump with accurate positioning according to claim 2, characterized in that: the clamping jaw (5 a) is an arc-shaped strip-shaped body.

4. The crankshaft direct-drive oil pump with accurate positioning according to claim 3, characterized in that: the number of the clamping jaws (5 a) is 3, and the 3 clamping jaws (5 a) are uniformly arranged on the inner wall surface of the positioning ring (5) at intervals in an annular mode.

5. The crankshaft direct-drive oil pump with accurate positioning according to claim 4, characterized in that: the positioning ring (5) is also provided with a notch (5 b).

6. The crankshaft direct-drive oil pump with accurate positioning according to claim 5, characterized in that: the notch (5 b) is located between two of the jaws (5 a) and corresponds to the distance between the two jaws (5 a).

7. The crankshaft direct-drive oil pump with accurate positioning according to claim 6, characterized in that: the positioning ring (5) and the pump body (1) are of an integrally formed structure.

Technical Field

The invention relates to the technical field of oil pumps, in particular to a crankshaft direct-drive oil pump with accurate positioning.

Background

The crankshaft direct-drive oil pump is an oil pump which is directly inserted into the oil pump and matched with an inner rotor to provide power.

Because the position degree error exists in the locating sleeve hole structure, the locating sleeve also has clearance fit error, and the crankshaft also has certain degree of beating in the motion process, this can lead to the eccentric of oil pump to appear the deviation, and then leads to the oil pump to appear wrong discharge capacity, still can appear the phenomenon that the rotor is crowded to one side even, accelerated wear.

The existing solution is to design a spigot in the form of a step surface matched with a pump body on the end surface of an inner rotor of an oil pump to limit the rotor to deviate from a shaft hole, thereby lightening the eccentric deviation of the rotor. But in fact, because the locating sleeve hole and the locating sleeve still have position and clearance fit errors, the problem that the crankshaft is assembled and then the crankshaft is assembled can still be faced to the eccentric problem, and the rotor is extruded to one side, so that the spigot of the rotor is abnormally abraded, and the problem cannot be fundamentally solved.

Disclosure of Invention

The invention aims to provide a crankshaft direct-drive oil pump with accurate positioning, which can reduce deviation errors generated in crankshaft assembly to the greatest extent, thereby preventing a rotor of the oil pump from being extruded to one side.

In order to solve the technical problems, the invention adopts the following technical scheme: the utility model provides an accurate bent axle of location directly drives oil pump, includes the pump body, pump cover, inner rotor and outer rotor, be equipped with a plurality of step faces that are used for cooperating bent axle outer wall longitudinal section on the internal face of inner rotor, set up on the pump body and supply bent axle male shaft hole, the internal face in shaft hole is provided with a plurality of convex jack catchs that can support and lean on the outer wall of living bent axle along the annular direction interval, and is through a plurality of the location restriction of jack catchs can improve the bent axle with the axis coincidence degree of the two in shaft hole.

Preferably, a positioning ring is fixedly arranged on the inner wall surface of the shaft hole along the annular direction, and the clamping jaw is arranged on the inner wall surface of the positioning ring.

More preferably, the jaw is an arc-shaped bar.

More preferably, the number of the clamping jaws is 3, and the 3 clamping jaws are uniformly arranged on the inner wall surface of the positioning ring at intervals in an annular shape.

More preferably, the positioning ring is further provided with a notch.

More preferably, the notch is located between two of the jaws and coincides with the spacing of the two jaws.

More preferably, the positioning ring and the pump body are of an integrally formed structure.

The invention has the beneficial effects that: the clamping jaws are arranged on the inner wall surface of the shaft hole of the pump body, so that the crankshaft is directly positioned at the center of the shaft hole by the clamping jaws in the assembling process, and the crankshaft and the shaft hole have higher axis contact ratio, so that the condition that the crankshaft is excessively deviated cannot occur after the crankshaft is matched with the inner rotor in the oil pump of the loader, the rotor can be prevented from being extruded to one side, the matching structure of the locating sleeve hole and the locating sleeve is directly omitted, and the error caused by the positioning and assembling mode of the original locating sleeve is eliminated.

Drawings

FIG. 1 is a schematic overall structure diagram in an embodiment of the present invention;

FIG. 2 is a schematic structural view of a pump body in the embodiment;

FIG. 3 is a schematic view of an assembly structure of the pump body and the crankshaft in the embodiment;

FIG. 4 is a schematic structural view of a crankshaft in the embodiment;

fig. 5 is a schematic structural view of an inner rotor in the embodiment.

The reference signs are:

1-pump body 2-inner rotor 2 a-step surface

3-crankshaft 3 a-longitudinal section 4-shaft hole

5-a positioning ring 5 a-a clamping jaw 5 b-a notch.

Detailed Description

In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention.

It should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are used broadly in the present invention, and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Further, in the present invention, unless otherwise expressly specified or limited, the first feature "on" or "under" the second feature may comprise the first and second features being in direct contact, or may comprise the first and second features being in contact, not in direct contact, but via another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature. The terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the invention.

As shown in fig. 1-5, a crankshaft direct-drive oil pump with accurate positioning comprises a pump body 1, a pump cover, an inner rotor 2 and an outer rotor, wherein a plurality of step surfaces 2a used for being matched with longitudinal sections 3a of the outer wall of a crankshaft 3 are arranged on the inner wall surface of the inner rotor 2, a shaft hole 4 for inserting the crankshaft 3 is formed in the pump body 1, a plurality of convex clamping jaws 5a capable of being abutted against the outer wall surface of the crankshaft 3 are arranged on the inner wall surface of the shaft hole 4 at intervals along the annular direction, and the shaft overlapping degree of the crankshaft 3 and the shaft hole 4 can be improved through the positioning limitation of the clamping jaws 5 a.

The crankshaft direct-drive oil pump with accurate positioning provided by the embodiment can directly align the crankshaft 3 of the engine to the shaft hole 4 of the pump body 1 and insert the crankshaft 3 into the shaft hole 4 without using a positioning sleeve hole for matching and positioning during assembly, in the process, the front part of the crankshaft 3 firstly passes through the shaft hole 4, then the outer wall surface of the shaft body of the crankshaft 3 can abut against the clamping jaws 5a, so that the axis of the crankshaft 3 and the axis of the shaft hole 4 are in a high degree of overlap, therefore, the crankshaft 3 can be stably installed into the oil pump without obvious deviation and form matching with the inner rotor 2, the rotor is effectively prevented from being extruded to one side, errors caused by the original positioning sleeve positioning assembly mode are eliminated, and persons skilled in the art know that when the crankshaft 3 and the shaft hole 4 are actually assembled, the outer wall surface and each clamping jaw 5a are designed in a small-clearance fit mode (similar to the fit mode of the oil pump shaft and the shaft hole), but under the restriction of each jaw 5a, the crankshaft 3 can be positioned to the right center of the shaft hole 4 basically, and because of the blockage of the jaw 5a, the crankshaft 3 can not be obviously deviated.

Preferably, a positioning ring 5 is fixedly provided on the inner wall surface of the shaft hole 4 in the circumferential direction, and each of the claws 5a is provided on the inner wall surface of the positioning ring 5.

On the basis, the clamping jaws 5a are arc-shaped strip-shaped bodies and can form good matching with the outer wall surface of the crankshaft, wherein the quantity of the clamping jaws 5a is 3, and the 3 clamping jaws 5a are annularly and uniformly arranged on the inner wall surface of the positioning ring 5 at intervals.

In the above embodiment, it should be understood by those skilled in the art that by providing a plurality of claws 5a to abut against and position the crankshaft 3 instead of using the inner wall surface of the entire positioning ring 5 to abut against and position the crankshaft 3, there are advantages, such as reducing the contact area between the positioning ring 5 and the crankshaft 3, i.e. reducing the friction generated therebetween, and discharging the normal oil leakage from the shaft hole 4 through the gap formed between the crankshaft 3 and the inner wall of the positioning ring 5, and of course, on the basis of this, a gap 5b may be provided on the positioning ring 5, and since the gap space between the positioning ring 5 and the crankshaft 3 is relatively small, for the sake of safety, another gap 5b is provided to assist oil discharge, so that the smoothness of oil discharge can be effectively improved.

It should be noted that the structure of the crankshaft 3 is shown in fig. 4, and in practice, the portion of the crankshaft 3 for fitting the inner rotor 2 is slightly smaller than the diameter of the shaft body of the crankshaft 3, and the outer wall surface of the shaft body is circular in outline and can contact with the claws 5a of the positioning ring 5 (shown in fig. 3).

Preferably, the gap 5b is located between two of the jaws 5a and coincides with the spacing of the two jaws 5 a.

In addition, in the present embodiment, the positioning ring 5 and the pump body 1 are integrally formed, so that the positioning ring 5 and the claws 5a have a more firm and reliable structure.

The above embodiments are preferred implementations of the present invention, and the present invention can be implemented in other ways without departing from the spirit of the present invention.

Some of the drawings and descriptions of the present invention have been simplified to facilitate the understanding of the improvements over the prior art by those skilled in the art, and some other elements have been omitted from this document for the sake of clarity, and it should be appreciated by those skilled in the art that such omitted elements may also constitute the subject matter of the present invention.